Class ExistsJoin

Represents a LeftJoin predicated on the existence/non-existence of joinable sets on the RHS for each item on the LHS.

Inheritance
object
ExistsJoin
Implements
Inherited Members
Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRdf.dll
Syntax
public class ExistsJoin : IExistsJoin, IAbstractJoin, ISparqlAlgebra, IVisitable, IProcessable

Constructors

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ExistsJoin(ISparqlAlgebra, ISparqlAlgebra, bool)

Creates a new Exists Join.

Declaration
public ExistsJoin(ISparqlAlgebra lhs, ISparqlAlgebra rhs, bool mustExist)
Parameters
Type Name Description
ISparqlAlgebra lhs

LHS Pattern.
ISparqlAlgebra rhs

RHS Pattern.
bool mustExist

Whether a joinable set must exist on the RHS for the LHS set to be preserved.

Properties

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FixedVariables

Gets the enumeration of fixed variables in the algebra i.e. variables that are guaranteed to have a bound value.

Declaration
public IEnumerable<string> FixedVariables { get; }
Property Value
Type Description
IEnumerable<string>
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FloatingVariables

Gets the enumeration of floating variables in the algebra i.e. variables that are not guaranteed to have a bound value.

Declaration
public IEnumerable<string> FloatingVariables { get; }
Property Value
Type Description
IEnumerable<string>
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Lhs

Gets the LHS of the Join.

Declaration
public ISparqlAlgebra Lhs { get; }
Property Value
Type Description
ISparqlAlgebra
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MustExist

Gets whether this is an EXISTS join.

Declaration
public bool MustExist { get; }
Property Value
Type Description
bool
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Rhs

Gets the RHS of the Join.

Declaration
public ISparqlAlgebra Rhs { get; }
Property Value
Type Description
ISparqlAlgebra
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Variables

Gets the Variables used in the Algebra.

Declaration
public IEnumerable<string> Variables { get; }
Property Value
Type Description
IEnumerable<string>

Methods

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Accept<T>(ISparqlAlgebraVisitor<T>)

Accept a simple algebra visitor.

Declaration
public T Accept<T>(ISparqlAlgebraVisitor<T> visitor)
Parameters
Type Name Description
ISparqlAlgebraVisitor<T> visitor

The visitor implementation.
Returns
Type Description
T
Type Parameters
Name Description
T

The type returned by the Visit methods of the visitor.
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ToGraphPattern()

Converts the Algebra back to a Graph Pattern.

Declaration
public GraphPattern ToGraphPattern()
Returns
Type Description
GraphPattern
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ToQuery()

Converts the Algebra back to a SPARQL Query.

Declaration
public SparqlQuery ToQuery()
Returns
Type Description
SparqlQuery
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ToString()

Gets the String representation of the Algebra.

Declaration
public override string ToString()
Returns
Type Description
string
Overrides
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Transform(IAlgebraOptimiser)

Transforms both sides of the Join using the given Optimiser.

Declaration
public ISparqlAlgebra Transform(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Optimser.
Returns
Type Description
ISparqlAlgebra
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TransformLhs(IAlgebraOptimiser)

Transforms the LHS of the Join using the given Optimiser.

Declaration
public ISparqlAlgebra TransformLhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Optimser.
Returns
Type Description
ISparqlAlgebra
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TransformRhs(IAlgebraOptimiser)

Transforms the RHS of the Join using the given Optimiser.

Declaration
public ISparqlAlgebra TransformRhs(IAlgebraOptimiser optimiser)
Parameters
Type Name Description
IAlgebraOptimiser optimiser

Optimser.
Returns
Type Description
ISparqlAlgebra

Implements

Extension Methods